I'm not clicking that Daily Heil link but agree with most that it was an inappropriate costume.
Bloody world book day and all the where's wally (not a book you read > crap pointless costume), disney spin offs, boring harry potter characters (at least those ones are inspired by actual books that children read)...
I wish they'd drop the whole thing. Stick to book day tokens, guest authors, book swaps and activites which encourage and celebrate reading. The main focus has become own-clothes-day with strings attached.